Engagement Rings & Diamonds. Custom Crafted in Toronto, Canada.

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Design Your Own Engagement Ring Today

Engagement rings range in price from $2,000 to $75,000 and above. Click the link below to start the custom design process and schedule a meeting.
A High-End Jewellery Store Experience

Our Goal is Sustainability

We like to rest easy at night, knowing we have made a beautiful piece of jewellery manufactured from environmentally sustainable materials.

We insist on only working with industry partners who are hard-working, trustworthy, and dependable, and who subscribe to the same values of promoting environmental sustainability and responsible practices. To that end, we are proud to work with recycled gold and platinum, as well as offer environmentally-responsible CanadaMark loose diamonds. We exclusively choose partners who are members of the Responsible Jewellery Council.

Recycled Gold and Platinum

We use recycled gold and platinum in our jewellery, preventing them from harming the environment.

CanadaMark Diamonds

We are proud to be an authorized distributor of CanadaMark diamonds, who are the standard bearers for providing responsibly and environmentally sustainably sourced diamonds from their mines in Canada’s Northwest Territories.

Conflict-Free and Responsibly Sourced Gemstones
Our promise to you is that your diamond or gemstone is obtained from verifiably responsible partners and is sourced from conflict-free mines, through fair trade and employment practices.

We Practice What We Preach

We make all of our products ourselves at our Toronto, Canada, facilities. Since we control the manufacture of your jewellery, you can rest assured that it was created responsibly and in a positive environment. We believe in providing our associates with fair wages and favourable working conditions.

We also believe in giving back to the community, and as such, we donate a portion of our sales to various charitable organizations.

Craftsmanship is at Our Core

We work with the finest artisans and use only the highest quality alloys and materials. We go the extra mile to make sure the engagement rings and jewellery we produce are made with an extreme eye to detail and precision. If a piece does not meet our exceptionally high-quality standards, we will start over and do it right at our cost.

The Finest Quality Diamonds and Gemstones

We employ only the highest-skilled jewellers and goldsmiths who work with the finest quality diamonds and gemstones. That means no brown tinges, no strong fluorescence, no surface inclusions, no cracks, and no centre black inclusions.

From top quality metal alloys to the most exquisitely cut and ethically sourced diamonds, you’ll be absolutely assured of the most excellent quality stone.

Completely Unique Creations

Your custom ring will be unlike any other on Earth, and she’s guaranteed to receive a ring that will be as unique and precious as your love.

Thorough Quality Inspection Process
Our attention to detail is second to none, and every piece is rigorously and thoroughly hand inspected before delivery. You’ll enjoy the peace of mind that comes with knowing each diamond has been strictly graded and expertly cut. We go well beyond the 4 C’s – carat, colour, clarity, and cut – delving into the crystal’s inner qualities and very carefully critiquing it based on its purity and various colourations – to ensure that we’ll never deliver a product that is anything less than perfect.

Complete Aftercare
Our partnership with you doesn’t end once we’ve delivered the perfect jewellery – it’s just the beginning. We provide a full range of services post-delivery to ensure you maximize your investment and fulfill her dreams.

Our free aftercare services include a ring sizing, as well as inspection and diamond or gemstone tightening to ensure a magical fit. We’ll clean your ring for the life of the ring, and we will be delighted to polish it for you before the wedding.

A Stress-Free Environment
Our mission is to consult with, advise, and educate you in a relaxed, private, and friendly environment. There are no commissioned salespeople with Jacob Mercari, just passionate jewellery design experts who are committed to helping you fulfill her dreams. You’ll never feel pressured in any way.

Your Jewellery is Ethically Produced
We take our ethical obligations seriously. All of our creations are made locally in Toronto, Canada, using only materials ethically produced and sourced from conflict-free conditions and using environmentally sustainable processes. We are an authorized distributor of CanadaMark diamonds, representing the pinnacle of responsible diamond trading.

We believe in offering our employees fair wages and employment conditions, as well as giving back to the community by donating a portion of our sales to charity.

Free Delivery
All of our products can be delivered to you free of charge, anywhere in North America.

We Keep Our Costs Low
We make our jewellery. Complete control over manufacturing lets us keep our costs down and our quality exceptionally high.

We also work directly with licensed diamond manufacturers to provide the most brilliant diamonds at the sharpest possible prices. With 30 years of experience in the business, we know what to look for and how to source the best products at a fair and reasonable cost.

Free Support
We provide free aftercare support for all our valued customers. From free ring sizings, tightening, and maintenance – we’re at your service to ensure your jewellery remains in pristine condition.

Ethical Partnerships
All of our industry partners are carefully screened and conform to the highest ethical standards, and we will only work with members of the Responsible Jewellery Council. Our partners are regularly audited for supply chain custody, ethics, and safe working conditions.

Responsible Sources
At such a special time in your life, you want to ensure that your diamonds are sourced from only responsible and ethical suppliers. We require our manufacturing partners be licensed to receive rough diamonds directly from responsible mining companies such as De Beers and Dominion Diamond Corporation to give you peace of mind from knowing that your diamond has been obtained fairly and responsibly.

We vet and confirm the quality of the sources of all of our diamonds and gemstones, and only obtain loose diamonds directly from the manufacturers – never through intermediaries.

CanadaMark Authorized Distributor
We offer loose diamonds from CanadaMark, a hallmark of the Canadian-owned Dominion Diamond Corporation committed to responsible mining and sustainable practices.

GIA Certified Diamonds
All of our diamonds are independently tested and certified by the Gemological Institute of America (GIA) to ensure their quality. Any diamond we sell will include a GIA report and grading certificate.

Recycled Materials
We are proud to use recycled gold sourced from previously mined jewellery and discarded electronics as part of a sustainable and responsible jewellery practice.

Meet Greg.

Greg Jacobson profile picture

Gregory Jacobson is the President & CEO at Jacob Mercari. 

He will be the person you will be in contact with to discuss any of your diamond & jewellery questions. Greg is easy to deal with and very knowledgeable about all things related to the jewellery industry. His goal is to make sure you are educated correctly and super excited about anything you decide to purchase through us!

Greg has over 14 years of experience in the diamond and jewellery industry with a real passion for helping his customers make the right decision when it comes to their jewellery purchases. He spent over a year in the early days overseas learning everything from manufacturing of diamonds and jewellery to the overall sale and distribution of the goods on a global scale.

Greg’s goal is to provide a relaxed, stress-free environment for customers to learn about diamonds, gemstones and other types of jewellery.

Book Your Meeting Today!

By Appointment Only.


1004-27 Queen St E
Toronto, ON M5C 2M6

Call or Text Message:

(416) 861-8204

Hours of Operation:

Monday – Thursday – 9:00am – 5:30pm EST
Friday – 9:00am – 4:00pm EST
Saturday – By Appointment Only 

Evening and Saturday Consultations are Available by Appointment


The short answer is yes. It is best to book an appointment with us to ensure you are given the necessary time and attention for your one-on-one personal visit. Please contact us to start the booking process. We do accept walk-ins, but time is limited, and preference is given to those who have scheduled a time with us.

A first meeting will generally range in time from thirty minutes to one hour. This is an average and we try to give you as much time as you need to get the information you are looking for. If more time is needed, we are happy to schedule additional meetings. This time frame usually covers all the important points. We do not rush these meetings and focus on your needs and make sure you are comfortable with the advice we provide.

Our philosophy is based on providing the best customer experience possible. So, in this vane, we start by learning what our customers are looking for and discuss any ideas or requirements they may have. We will then take our time to go over all the necessary information. We do not rush our customers, so you are free to take your time to decide or think about what we have discussed and contacted us with any further questions. Follow up meetings are welcomed and encouraged.

We work with our customers to find the perfect design and gems needed for the project. After this is complete, we send an invoice with all the details and diamond certificate numbers listed for reference and transparency. A small deposit is taken, with the remaining due at the time of completion.

The next phase is the computer CAD design phase where we work with you to make sure the design comes out exactly as you want. You can make as many changes or edits you require. Once again, we want you to be super excited about the design, so you are free to make as many edits as you wish.

After the design is complete and you have given the approval to continue, we will start the manufacturing by printing the design in 3D, casting, setting and polishing. After this, we do a final inspection and send the piece for an independent appraisal (included at no additional charge).

We will contact you when the piece is ready for review and schedule a time to meet and pick up at a time convenient for you.

Also note, throughout the process, customers are encouraged to check-in and see how things are going if they are curious or just would like an update. We value this continuous communication. Customers frequently comment, at the time of pickup, how easy the process is, how comfortable they feel and how fun buying an engagement ring can be!

We believe in giving our customers the option to choose between either mined, natural diamond or lab-grown diamonds. We carry both types of diamonds in stock to view in person. Deciding between mined and lab-grown diamonds is a personal choice. Our goal is to ensure you have all the information available to make an educated decision.

Jacob Mercari can custom make almost any type of jewellery you are in search of. Our specialty is custom engagement rings, but we frequently produce, pendants, diamonds studs, earrings, wedding bands, eternity bands and many other types. All our pieces are made locally in Toronto. This gives us the ability to more effectively oversee our production and assure the highest level of quality. We work in many metals such as gold (white, rose or yellow) and platinum. Gemstones and diamonds, both mined and lab, are commonly used as well.

See what we have been up to.

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We are here to help. Ask a question or request an appointment below.

Available By Appointment Only.

Monday – Thursday 9:00am – 5:30pm EST
Friday – 9:00am – 4:00pm EST

Click here for up-to-date hours

Evening and Saturday Consultations are Available